PDF malware analysis — malicious · cdce44da1516e23c

MALICIOUS

PDF

96.6 KB Created: 2021-07-02 19:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 4ee4296dcdd390b55b783eae29daee28 SHA-1: 8dab4605f2dddec12d6898d6fed24832b492279e SHA-256: cdce44da1516e23ce2136e58a0d45a66147a4158eb60ca84eb749fbd76f9fadc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://krisoc.ru/uplcv?utm_term=canale+tv+online PDF link annotation
- http://frezerovka.by/images/fxeditor/file/67618517755.pdfIn PDF document text
- http://irk-yoga.ru/upload/files/jotorapop.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb052b438d---58999274283.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/gumasubefabekatu.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c680edc373f---51266149163.pdfIn PDF document text
- https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/58229bbd4bbeb1baa54a926a63eb8d91/8301542616.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160837d26d58b4---77192692002.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7a8dfa3ba48465cd094452b85fe24936/68541472491.pdfIn PDF document text
- http://burelomdo.com/ckfinder/userfiles/files/15471371371.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/668eb302ceda0f420c7b371e5b8aad54/resupugibalupadav.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b66772ff02532a939be5306c739d2fd/65281149757.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f7d8da81---57282316858.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210603153126.pdfIn PDF document text
- https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c8c5438c1b6addb840cc237576b17391/dizaxemexugodefole.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dgf2qbqldusv5ns33mcm7ocvs1/wavavafu.pdfIn PDF document text
- http://msslink.ru/userfiles/files/95232843644.pdfIn PDF document text
- http://derma-dts.de/files/file/jukazojamale.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc051ce9c---35786718315.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/55900363058.pdfIn PDF document text
- https://yukkumpulgroup1.com/contents//files/33332886779.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3052b499---ritipuzugurulesaxipu.pdfIn PDF document text
- http://alliusie.com/userfiles/file/24324814647.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83843a605---rumurugijizidedoje.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fd634a05b9f35d6ddf067425a2bb5cc/26180777918.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/14b3f3ccdb7a6b39951b3cb0e1786263/wetevuju.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fd8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD8F	20620 bytes
SHA-256: `b822ded6118da70990266f1c9cbf594c0efceab17332e752871372f57ef0128e`
`font_01_sfnt_off00013102.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13102	16204 bytes
SHA-256: `2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489`
`font_02_sfnt_off000146b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x146B4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015eca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15ECA	9928 bytes
SHA-256: `1e65ae7c35a1b57df0491c36743a8580d265c478537ecd198b4daead192590f7`

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